THE EFFECTS OF MOLECULAR AND PROCESSING PARAMETERS ON ENERGY HARVESTING CAPABILITY OF PVDF-BASED NANOGENERATORS

1 CVEK Martin
Co-authors:
1 OSIČKA Josef 1 SRNEC Peter 1 MRLÍK Miroslav 2 TOFEL Pavel
Institutions:
1 Tomas Bata University in Zlín, University Institute, Centre of Polymer Systems, Zlín, Czech Republic, EU, cvek@utb.cz
2 Brno University of Technology, Department of Physics, Faculty of Electrical Engineering and Communication, Brno, Czech Republic, EU
Conference:
12th International Conference on Nanomaterials - Research & Application, Brno, Czech Republic, EU, October 21 - 23, 2020
Proceedings:
Proceedings 12th International Conference on Nanomaterials - Research & Application
Pages:
249-254
ISBN:
978-80-87294-98-7
ISSN:
2694-930X
Published:
28th December 2020
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
296 views / 138 downloads
Abstract

In the research of the alternative vibration sensing systems, the major potential is attributed to piezoelectric materials that can generate the electrical output from the waste vibration sources of the industrial machines. Poly(vinylidene fluoride) (PVDF), mostly in the electroactive β-phase, is a great option due to its excellent piezoelectric properties and good flexibility. The β-phase PVDF can be obtained by simple stretching of the α-phase PVDF films, and the conditions of this process are well documented. Surprisingly, the implications of molecular parameters of the PVDF have not been addressed yet. This study investigates the effect of the molecular weight (Mw) of the PVDF on the β-phase development and consequential vibration sensing capabilities after uniaxial stretching. The successful phase transformation was confirmed using FTIR and XRD. In the FTIR spectra, a typical α-phase peak at 762 cm–1 diminished giving rise to the β-phase peak at 840 cm–1 after the stretching. The results also showed a remarkable impact of the Mw on d33 coefficient making Mw an important parameter that should not be overlooked in designing the PVDF-based sensing elements. The obtained data are highly important for the optimization of the PVDF-based vibration sensors applicable in the efficient structural and health monitoring nanosystems.

Keywords: Nanosystem, vibration sensing, poly(vinylidene fluoride), crystallites, d33, electromechanical coupling

© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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